Question

Use diagram to answer question.

Three lines intersect at the vertex, labeled A. The first line is labeled D, the second line is labeled F, the third line is labeled H. D A H forms a ninety degree angle. A fourth line, labeled I B, intersects lines D, F, and H. The point where I B intersects D is labeled C. The point where I B intersects F is labeled E. The point where IB intersects H is labeled G.

The measure of angle E C A equals forty-nine degrees.
The measure of angle G A C equals ninety degrees.

angle E C A and angle D C B are vertical angles. What is the measure of angle D C B